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,主语从句,分类（1）由连词that引导的主语从句:引导词that无含义/在句中不做成分/不可以省。（2）用连词whether引导的主语从句:whether有含义(是否)/在句中不做成分/不可以省。（3）用连接代词引导的主语从句在由连接代词who,whose,whom,which,what,whoever,whomever,whichever,whatever引导的名词性从句中，其连接代词在句中起名词性作用，担当一定成分（4）用连接副词when,where,why,how引导的名词性从句(其连接副词有含义,在句中作状语。),注意点:it构成的主语从句（1）由连词that引导的主语从句，在大多数情况下会放到句子的后面，而用代词it作形式主语。（2）常见用it作形式主语的复合句结构Itis+名词+从句Itis+形容词+从句Itis+过去分词+从句Itseems（happened/appears/doesntmatter/makesnodifference/occurred）that,1.whether引导的从句常可以与连词or或ornot直接连用，而if一般不能。2.当宾语从句提到句首时，只能用whether引导，而不能用if。3.whether可以引导带to的不定式,if则不能。4.whether及其引导的成分可放于介词之后，作介词的宾语，但if不能。,练习Letmeknowwhetheryoucancomeornot.Letmeknowifyoucancomeornot.Whetheritistrueornot,Icanttell.Ifitistrueornot,Icanttell.Idontknowwhethertoacceptorrefuse.Idontknowiftoacceptorrefuse.IworryaboutwhetherIhurtherfeelings.IworryaboutifIhurtherfeelings.,补充,4种从句例句（1）Thatyouaresoindifferentbothersme.Thatshesurvivedtheaccidentisamiracle.（2）Whetherwewillholdapartyintheopenairtomorrowdependsontheweather.Whethersheiscomingornotdoesntmattertoomuch.（3）Whatyouneedismorepractice.WhatIwanttoknowisthis.Whateverwedoistoservethepeople（4）Whereweshouldleaveitisaproblem.Whentheywillcomehasntbeenmadepubic.,it构成的主语从句一.Thatlighttravelsinstraightlinesisknowntoall.=Itisknowntoallthatlighttravelsinstraightlines.Whentheplaneistotakeoffhasnotbeenannounced.=Ithasnotbeenannouncedwhentheplaneistotakeoff.二.Itis+名词+从句Itisafactthat事实是Itisgoodnewsthat是好消息Itisaquestionthat是个问题Itiscommonknowledgethat是常识Itis+形容词+从句Itisnecessarythat有必要Itisclearthat很清楚Itislikelythat很可能Itisimportantthat重要的是Itis+过去分词+从句Itissaidthat据说Itisreportedthat据报道Ithasbeenprovedthat已证明Itmustbeprovedthat必须指出,
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